Electromagnetic pollution of near-Earth space by power line emission

We present an overview, based on satellite observations at low Earth orbits, on electromagnetic radiation from ground power transmission lines at an industrial frequency 50–60 Hz. Particular attention has been given to Chibis-M and DEMETER satellite observations. The electric 40-cm antenna of the micro-satellite often recorded 50–60 Hz radiation (known as Power Line Emission (PLE)) when it flew over industrialized areas of the planet. The PLE spectral amplitude varied from 1.2 to 18 (μV/m)/Hz0.5, which corresponds to the electric field amplitude E~1 μV/m. We report results of numerical calculations of the electromagnetic response of the atmosphere and ionosphere to a large-scale surface emitter at a frequency of 50 Hz. According to simulation results, PLE with an intensity of ~1 μV/m observed on satellites in the nightside ionosphere at midlatitudes can be excited by an unbalanced current 8–10 A in a power transmission line above the earth's crust with conductivity of 10–3 S/m. At middle and low latitudes with an inclined geomagnetic field, the maximum response in the upper ionosphere to the transmission line radiation should be seen shifted equatorward, although this shift is less than that upon guidance by the geomagnetic field. The maximum amplitude of the electromagnetic response of the ionosphere to the power transmission line emission decreases for an inclined geomagnetic field, but insignificantly. To date, the PLE intensity in near-Earth space has turned out to be higher than the intensity of natural radiation in this range (Schumann resonances and ion whistlers), and continues to grow with the technological development of mankind.

Download Full-text

Identification power line sections with increased electricity losses using sensors with Wi-Fi technology for data transmission

E3S Web of Conferences ◽

10.1051/e3sconf/202017801053 ◽

2020 ◽

Vol 178 ◽

pp. 01053

Author(s):

A.V. Vinogradov ◽

A.V. Bukreev ◽

V.E. Bolshev ◽

A.V. Vinogradova ◽

M.O. Ward ◽

...

Keyword(s):

Transmission Line ◽

Data Transmission ◽

Single Phase ◽

Power Transmission ◽

Power Line ◽

Measured Data ◽

Power Lines ◽

Power Transmission Line ◽

Central Unit ◽

Three Phase

The article presents portable timers-electricity meters (PTEM) which are devices for examining 0.4 kV power lines. There are two developed several versions of the devices: single-phase PTEM used to examine single-phase branch lines to consumers, and three-phase PTEM used for any power line sections. Also, the method to identify sections of power lines with increased electricity losses by means of these devices is presented. The paper considers the application of the three-phase PTEM with Wi-Fi technology to transmit data. Up to six independent three-phase PTEMs with Wi-Fi technology can be installed at different points of the power transmission line and transmit measured data in real time to the central unit. The use of these devices allows determining both technological and commercial losses of electricity in different power line sections and draw conclusions about whether these losses are overestimated. On the basis of this, measures are taken to reduce losses.

Download Full-text

Influence of Power-line Current Condition on the Magnetic Field Distribution around Power Transmission Line

IEEJ Transactions on Power and Energy ◽

10.1541/ieejpes1990.118.4_437 ◽

1998 ◽

Vol 118 (4) ◽

pp. 437-443

Author(s):

M. Shimizu ◽

T. Nagae ◽

K. Kato ◽

N. Hayakawa ◽

M. Hikita ◽

...

Keyword(s):

Magnetic Field ◽

Transmission Line ◽

Field Distribution ◽

Power Transmission ◽

Power Line ◽

Magnetic Field Distribution ◽

Power Transmission Line ◽

Line Current ◽

The Magnetic Field

Download Full-text

Low Temperature Resistant Material Study of Fitting in Power Transmission Line

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.803.247 ◽

2013 ◽

Vol 803 ◽

pp. 247-252

Author(s):

Hai Jun Niu ◽

Jun Zhang ◽

Jia Jun Si ◽

Zhen Liu

Keyword(s):

Low Temperature ◽

Transmission Line ◽

Power Transmission ◽

Energy Resource ◽

Power Line ◽

Power Transmission Line ◽

Power Bases ◽

Resistant Material ◽

Long Distance ◽

Fitting In

Establishing large coal fired power, hydropower and wind power bases in the energy resources centre and large capacity long distance power energy transmission are main way to solve resource contradiction according to distribution characteristic of energy resource in our country. Power transmission line shall avoid influence of high altitude and low temperature etc environments in long distance power transmission, such as western area, the steel material of the fitting in the line with low temperature requirement shall have good low temperature resistant brittle, therefore the fittings in the power line are requested to have good low temperature resistant comprehensive performance. In combination with application environment of the power fittings and characteristics of metal material, carry out analysis on possibility of application of the low temperature resistant material in the fittings in the power line from performance requirements, fitting materials, geometrical features of the fittings, test characteristics of the fitting etc.

Download Full-text

One Type Damper Used for Preventing Galloping of the Electric Power Line

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.374-377.2057 ◽

2011 ◽

Vol 374-377 ◽

pp. 2057-2060

Author(s):

Li Min Sun ◽

Jing Chao Zou

Keyword(s):

Transmission Line ◽

Electric Power ◽

High Speed ◽

Power Transmission ◽

Power Line ◽

Power Transmission Line ◽

Patent License ◽

Electric Power Line ◽

New Type ◽

Overhead Power Line

When the power transmission line is covered with ice and snow in the winter, the galloping of power line often happens. A new type of damper used for preventing galloping of the electric power transmission line has been put forward and received patent license of China. The damper like fan blades, which can rotate about the axes of the power line at 360°, is fixed on the overhead power line. It hangs on the line when there is no wind. The blade rotates at high speed in the plane vertical to wind when there is wind, which results in a gyroscope. The theorem of angular momentum of a gyroscope is used in the design of the damper. Model tests of this kind of damper have been carried out and the results show that it is successful in preventing galloping of the cable model.

Download Full-text

Vacuum Zincification Technical Study of Fitting Material in Power Transmission Line

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.803.268 ◽

2013 ◽

Vol 803 ◽

pp. 268-273

Author(s):

Jun Zhang ◽

Kuan Jun Zhu ◽

Zhen Liu ◽

Jia Jun Si ◽

Hai Jun Niu

Keyword(s):

Transmission Line ◽

Power Transmission ◽

Power Line ◽

Power Transmission Line ◽

Strong Wind ◽

Application Process ◽

Performance Requirements ◽

Western Area ◽

Geometrical Features ◽

Atmosphere Environment

Fittings of the power transmission line are requested to have good anti-corrosion performance when they are use at atmosphere environment. The fittings of the power line have certain mutual movement during application process, which mutually produce friction. In particular to the fittings of the power line which are applied in the area and environment with strong wind sand such as western area, wind sand will produce corrosion wear of the fittings in the line. Therefore the fittings of the power line are requested to have good anti-abrasion and corrosion resistant comprehensive performance. In combination with application environment of the power fittings and characteristics of vacuum zincification technology, carry out analysis on possibility of application of vacuum zincification in the fittings in the power line from performance requirements, fitting materials, geometrical features of the fittings, economy of vacuum zincification etc several aspects.

Download Full-text